洁净煤技术

2019, (04) 59-64

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配煤煤灰熔融特性模拟研究
Simulation study of coal ash fusion characteristics of blended coal

王芳杰;唐玉林;夏国富;崔龙鹏;王树青;王大川;
WANG Fangjie,TANG Yulin,XIA Guofu,CUI Longpeng,WANG Shuqing,WANG Dachuan

摘要(Abstract):

煤灰熔融特性是影响液态排渣气化炉运行稳定性的重要因素,高熔点煤会造成气化炉排渣困难,从而导致气化炉非计划停工。为了将高灰熔融温度的朱集西煤应用于液态排渣的SE-东方炉,利用热力学软件Factsage,研究朱集西煤、神华煤、门克庆煤及朱集西-神华配煤、朱集西-门克庆配煤的煤灰熔融特性,包括全液相温度、灰渣矿物组成及煤灰黏度的变化规律。朱集西-门克庆配煤和朱集西-神华配煤的完全熔化温度分别为1 390℃和1 400℃,配煤灰熔融温度并不是单纯2种煤的灰熔融温度加和; 800℃时2种配煤中堇青石和钙长石含量较高,900℃时朱集西-神华配煤灰中出现少量尖晶石;朱集西-神华配煤在黏度为25 Pa·s时的温度为1 400℃。结果表明,朱集西-门克庆配煤可满足SE-东方炉入炉煤的煤灰流动温度要求,但其在SE-东方炉正常操作温度下灰渣黏度较大,无法顺利排出;朱集西-神华配煤在有效降低灰熔融温度的同时,改善了灰渣的黏温特性,与主体煤朱集西煤相比,灰渣黏度为25 Pa·s时的温度降低100℃,渣型由“塑性渣”变为“玻璃渣”,适用于SE-东方炉。朱集西-神华配煤中熔融温度低的堇青石和钙长石含量较高,钙长石和尖晶石形成低温共熔体,是配煤灰熔融温度低的主要原因。
The fusion characteristics of coal ash are important factors of affecting the operation stability of the liquid slagging gasifier.The high fusion point coal will make it difficult to discharge slag from gasifier,which will lead to unplanned shutdown of the gasifier.In order to apply the Zhujixi coal with high ash fusion temperature to SE gasification furnace with liquid slagging,the ash fusion characteristics of Zhujixi coal,Shenhua coal,Menkeqing coal and Zhujixi-Shenhua blended coal were studied by thermodynamic software of Factsage,including the whole liquid phase temperature,ash mineral composition and ash viscosity.The complete fusion temperatures of Zhujixi-Mengkeqing blended coal and Zhujixi-Shenhua blended coal are 1 390 ℃ and 1 400 ℃,respectively.The fusion temperature of coal blending ash is not the sum of the ash fusion temperatures of the two coals.At 800 ℃,the content of cordierite and anorthite in the two kinds of blended coal is relatively high.At 900 ℃,a small amount of spinel appears in Zhujixi-Shenhua blended coal ash.The temperature of Zhujixi-Shenhua blended coal is 1 400 ℃ when its viscosity is 25 Pa·s.The results show that Zhujixi-Mengkeqing blended coal can meet the temperature requirements of fly ash flowing in SE gasification furnace,but its ash viscosity is high at the normal operating temperature of SE gasification furnace and cannot be discharged smoothly.The Zhujixi-Shenhua blended coal can not only effectively reduce the ash fusion temperature,but also improve the flow type of ash and reduce the ash viscosity.Compared with the main coal Zhujixi coal,the temperature is reduced by 100 ℃ when the ash viscosity is 25 Pa·s,and the slag type is changed from "plastic slag" to "glass slag",which is suitable for SE gasification furnace.The content of cordierite and feldspar with low melting temperature is higher in Zhujixi-Shenhua blended coal.Calcium feldspar and spinel form low temperature eutectic,which is the main reason of low temperature of the blended coal ash melting.

关键词(KeyWords): SE-东方炉;配煤;Factsage;熔融温度;煤灰黏温特性
SE gasification furnace;coal blending;Factsage;fusion temperature;viscosity-temperature characteristics of coal ash

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作者(Author): 王芳杰;唐玉林;夏国富;崔龙鹏;王树青;王大川;
WANG Fangjie,TANG Yulin,XIA Guofu,CUI Longpeng,WANG Shuqing,WANG Dachuan

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